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Alibaba ACA-Operator Exam - Topic 6 Question 55 Discussion

Actual exam question for Alibaba's ACA-Operator exam
Question #: 55
Topic #: 6
[All ACA-Operator Questions]

After you enable health checks of Server Load Balancer (SLB), when one backend ECS instance is declared as unhealthy, which of the following statements is correct?

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Suggested Answer: A, C, D

by Eladia at Mar 16, 2024, 02:09 PM

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Tawny
3 months ago
C and D are definitely wrong, SLB should reroute requests.
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Stacey
3 months ago
A is misleading, it doesn't shut down the instance right away.
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Lizette
4 months ago
Wait, how can you be sure? What if it just returns an error?
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Josephine
4 months ago
Totally agree, B makes the most sense!
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Chaya
4 months ago
I think B is correct. SLB handles unhealthy instances well.
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Carisa
4 months ago
I’m leaning towards option B as well, but I’m a bit confused about what happens when the unhealthy instance recovers. Does it really start receiving requests again?
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Bernardine
5 months ago
I practiced a similar question, and I feel like option D is wrong because a 500 error usually indicates a server issue, not just an unhealthy instance.
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Annalee
5 months ago
I'm not entirely sure, but I remember something about unhealthy instances being ignored. Maybe it's option A?
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Iesha
5 months ago
I think option B sounds familiar because it mentions that requests go to other normal instances, which is what load balancers usually do.
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Gilma
5 months ago
I've got this! The key is understanding that the unhealthy instance is not shut down, it's just removed from the load balancing rotation. So B is the correct answer - requests are forwarded to other healthy instances, and once the faulty one is healthy again, it'll be added back in.
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Marisha
5 months ago
Okay, let me break this down. If an instance is unhealthy, the SLB won't send traffic to it, so the requests must go somewhere else. B seems like the most logical answer, but I'll double-check the other options just to be sure.
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Miriam
5 months ago
Hmm, I'm a bit confused on this one. I'm not sure if the requests are forwarded to other instances or if there's an error returned. I'll need to think this through carefully.
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Evan
5 months ago
I think the correct answer is B. The question is asking what happens when one backend ECS instance is declared as unhealthy, and B states that requests are forwarded to other normal ECS instances, and when the faulty instance becomes normal again, SLB will forward requests to it.
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Wilford
5 months ago
I think I've got a good handle on this. The key is that the question is asking for a solution that can work within the 172.16.168.0/22 subnet. Based on that, I'm going to go with option A, stateful NAT64.
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Leota
5 months ago
Ah, I remember learning about the search head cluster deployer in class. I'm pretty confident I know the right approach here, so I'll go ahead and select my answer.
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Naomi
5 months ago
Hmm, I'm a bit unsure about this one. I know TCB has something to do with security, but I can't quite remember the exact definition. I'll have to think this through carefully.
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Merissa
10 months ago
Hah, imagine if the system just shut down the unhealthy instance without warning! Talk about a dramatic solution. I'll take B - nice and balanced.
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Brianne
9 months ago
User 3: Definitely, balancing the requests makes more sense.
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Chantell
9 months ago
User 2: I agree, option B seems like a more reasonable approach.
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Amira
10 months ago
User 1: Yeah, that would be quite the surprise!
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Yuki
11 months ago
D has to be the correct answer. A 500 error indicates a server-side issue, which is exactly what I'd expect when an instance is unhealthy.
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Omer
10 months ago
I agree with you, D seems to be the most logical choice. A 500 error makes sense for a server-side issue.
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Theodora
10 months ago
I think B is the correct answer. SLB will forward requests to other normal instances until the faulty one becomes healthy again.
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Laurel
11 months ago
I'm going with C. If an instance is unhealthy, it shouldn't be receiving any traffic at all - a 400 error is the logical response.
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Nina
11 months ago
Option B seems the most reasonable. Forwarding requests to other healthy instances while monitoring the unhealthy one for recovery makes the most sense.
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Lon
10 months ago
Exactly, it's all about maintaining the availability and reliability of the application.
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Freeman
10 months ago
That way there is minimal disruption to the service.
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Evangelina
10 months ago
Yes, it's important to ensure that requests are still being handled while the unhealthy instance is being monitored.
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Shawana
10 months ago
I agree, option B does seem like the most logical choice.
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Dahlia
11 months ago
I'm not sure. I think it might be C. Requests are not forwarded and you get a 400 error.
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Alex
11 months ago
I agree with Werner. SLB forwards requests to other normal ECS instances until the faulty one becomes normal again.
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Werner
11 months ago
I think the answer is B.
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